US4310917A - Pick-up - Google Patents

Pick-up Download PDF

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Publication number
US4310917A
US4310917A US06/014,992 US1499279A US4310917A US 4310917 A US4310917 A US 4310917A US 1499279 A US1499279 A US 1499279A US 4310917 A US4310917 A US 4310917A
Authority
US
United States
Prior art keywords
pick
stylus arm
plane
armature
inertial body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/014,992
Other languages
English (en)
Inventor
Bjarne S. Hansen
Knud H. Andersen
Robert Gudmandsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ORTOFON Manufacturing AS
Original Assignee
ORTOFON Manufacturing AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ORTOFON Manufacturing AS filed Critical ORTOFON Manufacturing AS
Application granted granted Critical
Publication of US4310917A publication Critical patent/US4310917A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/16—Mounting or connecting stylus to transducer with or without damping means

Definitions

  • the invention relates to a pick-up of the type comprising an armature disposed perpendicularly to the end of a stylus arm and abutting on one side of a damper device which is firmly supported on the other side.
  • the damping device is a rubber pad against which the armature is clamped by a nickel-plated piano wire whose one end enters into and is secured in an axial central bore in the end of a pole leg, and whose other end is attached in the end of the tubular stylus arm.
  • the nickel-plating is removed on a short section immediately behind the armature, and this section constitutes the pivot of the armature about which it may swing in all directions when the stylus moves in a stereo audio track.
  • the rubber pad serves both as a bearing element and as a return spring determining the neutral position of the stylus arm and the armature and exerting at the same time a vibration damping effect on the moving system.
  • the rubber pad must be rather stiff and consequently it must preferably consist of a hard rubber having a high modulus of elasticity. The great stiffness required of the bearing element limits the stylus elasticity and trackability of the pick-up.
  • the Danish Published Application No. 137 560 teaches to supplement the moving system of the pick-up by one or more fixedly supported rubber parts abutting on the moving parts at a greater distance from their pivot and with a smaller pressure than the elastic bearing element.
  • the damping function is partly separated from the bearing function, permitting each of these functions to be improved without this being done at the expense of the other.
  • the object of the invention is to provide a dynamic vibration damper suitable for use in a pick-up of the subject type, and this purpose is achieved in that the damping device consists of at least two elastic pads between which at least one inertial body is located.
  • the only amendment required of the conventional construction is the insertion of an inertial body and an additional elastic pad between the armature and the usual bearing pad.
  • Both bearing pads may consist of comparatively soft material having good damping properties, for example butyl rubber. At frequencies considerably below the resonance frequency of the vibration damper consisting of the elastic pads and the inertial body or bodies, said damper will behave substantially as a continuous comparatively soft rubber pad whose mass has no noticeable influence on the performance of the pick-up, and which gives a good stylus compliance and trackability.
  • the inertial body or bodies will remain substantially stationary so that the vibration damper functions as if the outermost elastic pad were the only damping element, resulting in an increase of the effective stiffness.
  • the inertial body or bodies may for example consist of platinum with a specific weight of 21.4. Thanks to the manner in which the moving system is mounted in said conventional pick-up having a flat armature, no special attachment means to the inertial body or bodies and to the additional elastic pad are required since these parts are firmly clamped by the tension of the piano wire.
  • a particularly expedient embodiment of the pick-up is characterized in that the inertial body is an annular disc.
  • the inertial body will be safely centred with respect to the axis of the moving system by providing the innermost elastic pad with an central projection extending into and fitting in the central hole in the inertial body.
  • armature 11 In the drawing 10 is the end portion of a cylindrical pole leg guiding the magnetic flux from a permanent magnet (not shown) to the air gap between the pole leg and a yoke (not shown) located opposite the pole leg, said yoke guiding the flux back to the magnet.
  • armature 11 In the air gap there is positioned a flat, substantially square armature 11 that may consist of a magnetically conductive or magnetically non-conductive material and is provided with windings (not shown).
  • the armature is secured on the rear end of a tubular stylus arm 12 extending through a central hole in the armature and carrying a stylus 13 at its front end.
  • the rear end of the stylus arm 12 mounts one end of a piano wire 15 coated with a nickel-plating, and the other end of said wire is secured in a sleeve 16 which in turn is attached in an axial central bore 17 in the end of the pole leg 10 by means of a screw which is screwed into a radial, threaded bore in the pole leg.
  • the nickel-plating 14 is removed on a short section immediately adjacent the armature as shown at 19.
  • a bearing device is mounted between the pole leg 10 and the armature 11 and consists of two annular pads 20 and 21 of butyl rubber and an intermediate disc-shaped inertial body 22 of platinum.
  • All three discs have a central bore for the nickel-plated piano wire, and the central hole in the platinum disc 22 and the outermost rubber disc 21 have a diameter considerably larger than the nickel-plating 14 of the wire.
  • the innermost rubber disc 20 is formed with an axial central projection 23 fitting into the central hole in the platinum disc 22 and thus keeping it centred.
  • the elastic pads may consist of a material other than butyl rubber and may be divided into several discs having different properties.
  • the inertial body may also comprise a material other than platinum, for example tin, and it may also be composed of or divided into several parts that may be separated from each other by elastic pads.
  • the details of the shown and described construction may also be changed in other ways.
  • the various parts of the damping and bearing device of the moving system may for example be glued to each other and to the armature and the pole leg instead of being clamped to these latter parts by the tension in a piano wire, which means that this wire may be omitted.
US06/014,992 1978-02-28 1979-02-26 Pick-up Expired - Lifetime US4310917A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK90478AA DK140919B (da) 1978-02-28 1978-02-28 Pick-up.
DK904/78 1978-02-28

Publications (1)

Publication Number Publication Date
US4310917A true US4310917A (en) 1982-01-12

Family

ID=8098837

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/014,992 Expired - Lifetime US4310917A (en) 1978-02-28 1979-02-26 Pick-up

Country Status (5)

Country Link
US (1) US4310917A (ja)
EP (1) EP0004158B1 (ja)
JP (1) JPS54124701A (ja)
DE (1) DE2962166D1 (ja)
DK (1) DK140919B (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4519063A (en) * 1980-07-01 1985-05-21 Pioneer Electric Corporation Phono pickup cartridge

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3071154D1 (en) * 1979-12-19 1985-11-07 Matsushita Electric Ind Co Ltd Electromagnetic pickup cartridge

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909008A (en) * 1973-07-13 1975-09-30 Pioneer Electronic Corp Pick-up cartridge with improved oscillating system
US3991284A (en) * 1973-01-25 1976-11-09 Karl Braun Gramaphone pickup
US4138122A (en) * 1976-06-22 1979-02-06 Ortofon Manufacturing A/S Pickup
US4194744A (en) * 1978-02-01 1980-03-25 Shure Brothers, Incorporated Phonograph pick-up transducer using a one-piece bearing and inertial damper fabricated from different materials

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2591996A (en) * 1949-01-14 1952-04-08 Fonofilm Ind As Moving-coil phonograph pickup
US2776342A (en) * 1951-10-25 1957-01-01 Gen Electric High fidelity phonograph stylus assembly
DE1572396A1 (de) * 1967-07-05 1969-10-30 Karl Braun Elektromagnetischer Tonabnehmer fuer stereophonische Schallplattenaufzeichnung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991284A (en) * 1973-01-25 1976-11-09 Karl Braun Gramaphone pickup
US3909008A (en) * 1973-07-13 1975-09-30 Pioneer Electronic Corp Pick-up cartridge with improved oscillating system
US4138122A (en) * 1976-06-22 1979-02-06 Ortofon Manufacturing A/S Pickup
US4194744A (en) * 1978-02-01 1980-03-25 Shure Brothers, Incorporated Phonograph pick-up transducer using a one-piece bearing and inertial damper fabricated from different materials

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Dynamic Vib. Absorber Principle Applied to a High Quality Phono Pickup" Journal of Audio Eng., 6/1977 vol. 25 #6 pp. 385-390. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4519063A (en) * 1980-07-01 1985-05-21 Pioneer Electric Corporation Phono pickup cartridge

Also Published As

Publication number Publication date
EP0004158A1 (en) 1979-09-19
EP0004158B1 (en) 1982-02-24
DK140919C (ja) 1980-05-19
DK140919B (da) 1979-12-03
DK90478A (ja) 1979-08-29
JPS54124701A (en) 1979-09-27
JPS6123561B2 (ja) 1986-06-06
DE2962166D1 (en) 1982-03-25

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